Compaction Mapping — Subgrade

GNSS Machine Control

GNSS machine control combines positioning, machine geometry and design information. An accurate receiver position is not automatically an accurate cutting-edge position.

Before moving material

Confirm corrections, sensor arrangement and the coordinate reference.

Receiving operation and checks

Check the completed surface with an independent method. Inspect offsets, design revision and correction status when results disagree.

Compatibility must be confirmed for the actual machine and control installation.

Machine-Control Systems

Machine-control systems can display guidance or command hydraulic movement; those are different functions. An installation should identify sensors, design input, actuator control and the operator's remaining responsibilities.

Before moving material

Document the proposed complete control chain.

Receiving operation and checks

Commission the installation before relying on production output. Test known reference points and observe response under a controlled method.

Do not assume brand-name receivers or tractor systems are mutually compatible.

Elevation Control

Elevation control keeps a working edge or surface related to an agreed height reference. The relevant height belongs to the cutting or placement task, not merely the receiver or tractor.

Before moving material

Establish a reliable reference and identify offsets.

Receiving operation and checks

Verify the formed surface independently. Recheck after equipment adjustments or movement of reference equipment.

A correct instrument reading does not alone prove the finished material is suitable.

Record the job inputs

Use this checklist to turn the scenario into a specific brief. Retain the design revision and agree who accepts each completed layer.

• Existing condition, extent and the reason for intervention
• Required finished purpose, receiving operation and acceptance criteria
• Material type, layer role, source, receiving area and volume state
• Reference levels, datum, survey method and issued design revision
• Available tractor, implement configuration, travel route and turning space
• Checks before work, stopping points and evidence retained at handover

Checklist ticks apply only while this page is open. Include the completed brief in your project records.

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